The challenge description calls for playing the full game with one of each tower. It does not specify whether “once” means once per stage or once across the entire run, so confirm the rule you’re following before placing a duplicate.
To attempt the challenge, track which tower types you’ve placed and avoid using a type again under your chosen interpretation of the limit. The supplied description gives no tower-placement strategy or other gameplay requirements.
Free Kingdom Rush 5: Alliance TD+ Codes
Current active codes and how to redeem them.
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Player Comments
114 players commented on this guide.
I wish I had read this before upgrading the wrong thing.
The tips are practical and easy to follow.
This helped me understand strategy much better.
Good guide for Kingdom Rush 5: Alliance TD+ players. The strategy part was useful.